Automatically releasing safety-valve weights



(No Model.)

' I W. T. KING.

AUTOMATICALLY RELEASING SAPEIY VALVE WEIGHTS. No. 288,710. P xtente'd Nov. 20, 1883. V

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UNITED STATES PATENT OFFICE.

WILLIAM T. KING, OF CAMBRIDGEPOBT, MASSACHUSETTS.

AUTOMATICALLY RELEASING SAFETY-VALVE WEIGHTS.

SPIECIFICATION forming part of Letters Patent No. 288,710, dated November 20,- 1883.

Application filed February 23, 1883. (No model.)

boiler in the event of the burning of the building in which the boiler is located, so that the pressure upon the valve may be removed to prevent'the bursting of the boiler, and alsoto allow the steam to escape and aid materially in extinguishing the flames.

The invention consists of a fusible material forming a part of any connection between the safety-valve and the weight, and also of a fusible and combustible material in combination with a safety-valve lever and its weight.

Referring to the accompanying drawings,

Figure 1 represents a safety-valve of ordinary construction and embodying my improvement. Fig. 2 is a front view of the suspending device and weight, with a section of the lever. Fig. 3 is a modification of the cross bar and suspending device.

a. is the casing inclosing the safety-valve. s is the valve-stem; b, the lever fulcrum and guide. 0 is the lever, and d the carriage on which the weight e is suspended by the device f. These are of the usual construction.

The suspending device or loop f may be made of cat-gut or rawhide, or other analogous material which, while being readily combustible, is sufficiently strong to sustain any required weight. it is a bar attached to the ends of the loop f, and supporting the eye 9, to which the weight e is attached. The bar h is to be made of some fusible metal or compound which will melt at, say, 160 Fahrenheit. Instead of a solid piece of fusible material, the bar may be made of two pieces of iron, h, soldered together by a fusible material, as indicated by lc, Fig. 3, in case a solid bar of fusible metal should not be sufficiently strong to bear the weight 6. When the fusible material is used, the loop f maybe of metal, instead of catgut, &c., and either may be used separately or both at the same time, as desired.

I do not confine myself to any particular position of the fusible joint or fusible material, as it is evident that it may be placed at any point between the safety-valve and the Weight, my object being to place it in relation to the safety-valve and the weight as will cause the weight to be released under the circumstances before mentioned.

What I claim as my invention is 1. In a boiler safety device, a fusible connection placed between the safety-valve lever and the weight, substantially as and for the purpose set forth.

2. The combination, with a safety-valve lever, of a fusible and combustible connection placed between the lever and the weight,-substantially as and for the purpose set forth.

In testimony whereof Ihave signed my name to this specification in the presence of two sub- 

